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Preparation of aqueous green inkjet compositions

a technology of green inkjet ink and composition, which is applied in the field of preparation of aqueous green inkjet ink composition, can solve the problems of particle size, particle size, and unexpected increase in particle size from agglomeration of smaller particles, and achieve the effect of expanding color gamut, improving color reproduction of original color images, and expanding color gamu

Active Publication Date: 2017-10-12
EASTMAN KODAK CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is about improving the color range of aqueous green inkjet ink by using certain pigments and adding certain ingredients. This results in better color reproduction when printed with other aqueous color inkjet inks. The invention also improves the shelf life of the ink by reducing pigment agglomeration. This is achieved by using a specific combination of green and yellow pigments. Overall, the invention expands the color range and improves the quality of aqueous green inkjet ink.

Problems solved by technology

Yet, it has been difficult to mill the noted green organic pigments to such small particle sizes for incorporation into the inkjet ink compositions.
When attempts were made to mill common green pigments to the desired particle size, the particle size is initially reduced but as milling continues, the particle size unexpectedly increases from agglomeration of the smaller particles.

Method used

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  • Preparation of aqueous green inkjet compositions
  • Preparation of aqueous green inkjet compositions
  • Preparation of aqueous green inkjet compositions

Examples

Experimental program
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Effect test

invention example 1

ment Dispersion 1

[0132]An aqueous organic pigment dispersion was prepared according to the present invention in the following manner:

[0133]To a double-walled stainless steel mixing vessel containing four baffles, were added 374 g of water and 924 g of a 15 weight % solution of potassium-neutralized organic pigment dispersant that was a terpolymer (Polymer P-1) derived by emulsion polymerization of benzyl methacrylate, stearyl methacrylate, and methacrylic acid at a feed weight ratio of 37:30:33 and having an Mw of 8,700. A nominal 6-inch (15.2 cm) ring-style disperser impeller (Hockmeyer Equipment Corporation, D-Blade) driven by a Hockmeyer Model HBI-7.5-11-99 High Shear Mixer was centered 3 inches (7.62 cm) above the bottom of the mixing vessel and stirring was initiated.

[0134]C.I. Pigment Yellow 74 (a monoazo-coupled β-ketoamide yellow pigment with 3 weight % of an anionic stabilizer, obtained from Sun Chemical) (41.84 g) and C.I. Pigment Green 7 (Sun Chemical) (156.2 g) were adde...

invention example 2

ment Dispersion 2

[0135]An aqueous organic pigment dispersion was prepared according to the present invention similar to aqueous organic pigment Dispersion 1 above where the monoazo-coupled β-ketoamide yellow pigment (from Clariant Corporation) (41.84 g) containing no anionic stabilizer and C.I. Pigment Green 7 (Sun Chemical) (156.2 g) were incorporated. The resulting Dispersion 2 had a 50% Intensity mode particle size of 69 μM and a 95% Intensity mode particle size of 121 μm as characterized using a Nanotrac Auto Sampler NAS35 (Nanotrac Inc., Nanotrac Brand).

invention example 3

ment Dispersion 3

[0136]An aqueous organic pigment dispersion was prepared according to the present invention similar to aqueous organic pigment Dispersion 1 above with a different organic pigment weight ratio, that is, where the monoazo-coupled β-ketoamide yellow pigment (from Sun Chemical) (36.04 g) and C.I. Pigment Green 7 (Sun Chemical) (161.96 g) were incorporated. The resulting Dispersion 2 had a 50% Intensity mode particle size of 68 μm and a 95% Intensity mode particle size of 127 μm as characterized using a Nanotrac Auto Sampler NAS35 (Nanotrac Inc., Nanotrac Brand).

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Abstract

An aqueous organic pigment dispersion contains a green copper phthalocyanine pigment and an azo-coupled β-ketoamide pigment. It also includes an organic pigment dispersant at 40 weight % to 100 weight %, based on the sum of the weights of the organic pigments. This aqueous organic pigment dispersion can be combined with a humectant to provide an aqueous green inkjet ink composition. The weight ratio of the green copper phthalocyanine pigment to the azo-coupled β-ketoamide pigment is from 1:1 to 10:1. The median particle diameter of each of the green copper phthalocyanine pigment and the azo-coupled β-ketoamide pigment is less than 85 nm. At least 95% of the total particles of each of the green copper phthalocyanine pigment and the azo-coupled β-ketoamide pigment have a particle diameter of less than 150 nm. The aqueous green inkjet ink compositions can be used in various inkjet printing methods.

Description

RELATED APPLICATIONS[0001]This is a divisional of application Ser. No. 15 / 092,649, filed Apr. 7, 2016, the disclosure of which is incorporated herein by reference.[0002]Reference is also made to the following related copending and commonly assigned patent application and patent:[0003]U.S. Ser. No. 15 / 092,642 filed on Apr. 7, 2016 by Lussier and Linehan and entitled “Aqueous Green Pigment Dispersions and Inkjet Compositions”; and[0004]U.S. Pat. No. 9,605,169 by Lussier and Linehan and entitled “Method of Inkjet Printing Green Images.”FIELD OF THE INVENTION[0005]This invention relates to the preparation of aqueous green inkjet ink compositions that contain a green copper phthalocyanine pigment and an azo-coupled β-ketoamide pigment. These compositions can be used to provide inkjet printed images with expanded color gamut on various substrates using either drop-on-demand (DOD) or continuous inkjet processes (CIJ).BACKGROUND OF THE INVENTION[0006]Inkjet printing systems are generally of...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09D11/322C09D11/38C09D11/102C09D17/00C09D11/107
CPCC09D11/322C09D17/003C09D11/38C09D11/102C09D11/107C09D5/027C09D11/40C09B67/0035C09B67/0034C09B67/0041
Inventor LUSSIER, BARBARA BOLANDLINEHAN, DANIEL TALBOT
Owner EASTMAN KODAK CO
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